190 CRINOIDS. 



A very large, coarsely sculptured form with massive col- 

 umn, slender, clustered arms and strongly lobed calyx ; ventral 

 tube long, spinous. 



Horizon and localities. — Lower Carboniferous, Keokuk 

 limestone : Kahoka ( Clark county) ; Keokuk ( Iowa). 



Actinocrinus lobatus Hall. 

 Adinocrinua lobatus Hall, 1860: Geology Iowa, vol. I, Supp., p. 51. 

 Actinocrinus lobatus Worthen, 1890: Geol. Sur. Illinois, vol. VIII, p. 97, 

 pi. xii, figs. 8-8a. 



Like A. lowei, but calyx higher, more angular ; ventral side 

 elevated ; plates not so tuberculose. 



Horizon and localities. — Lower Carboniferous, Keokuk 

 limestone: Kahoka (Clark county); Keokuk (Iowa); War- 

 saw (Illinois). 



Actinocrinus jugosus Hall. 

 Actinocrinus jugosus Hall, 1860: Geology Iowa, vol. I, Supp., p. 49. 



Closely related to A. lowei Hall. 



Horizon and localities. — Lower Carboniferous, Keokuk 



limestone: Keokuk ( Iowa). 



Actinocrinus pernodosus Hall. 



Actinocrinus pernodosus Hall, 1858 : Geology Iowa, vol. I, p. 608, pi. xv, figs. 

 3a-b. 



Another form of the A lowei type. 



Horizon and localities. — Lower Carboniferous, Keokuk 



limestone : Wayland ( Clark county). 



Teliocrinus umbrosus ( Hall). 



Actinocrinus urnbrosus Hall, 1858: Geol. Iowa, vol. I, p. 590, pi. xi, figs. 



.3a-b. 

 Strotocrinus umbrosus Meek & Worthen, 1866 : Geol. Sur. Illinois, vol. 11, 



p. 190. 

 Actinocrinus delicatus Meek & Worthen, 1869: Proc. Acad. Nat. Sci., 



Phila., p. 15. 

 Actinocrinus delicatus Meek & Worthen, 1873: Geol. Sur. Illinois, vol. V, 



p. 243, pi. viii, fig. 2. 

 Strotocrinus umbrosus Meek & Worthen, 1873: Geol Sur. Illinois, vol. V, 



p. .360, pi. viii, fig. 5. 

 Teliocrinus umbrosus Wachsmuth and Springer, 1881 : Proc. Acad. Nat. 



Sci., Phila., p. 323. 

 Teliocrinus uynbrosus Keyes, 1890: Am. Naturalist, vol. XXIV, p. 254, 



pi. viii, fig. 4. 



